Scratch changes for fix have_seen_event not being invalidated

See https://github.com/matrix-org/synapse/issues/13856

docker/complement/conf/workers-shared-extra.yaml.j2

@@ -31,7 +31,9 @@ federation_ip_range_blacklist: []
 # Disable server rate-limiting
 rc_federation:
   window_size: 1000
-  sleep_limit: 10
+  # foo: We run into the rate limiter hard with the MSC2716 tests.
+  # We go from 35s /messages requests to 20s just by making `/state_ids` and `/state` go faster
+  sleep_limit: 99999
   sleep_delay: 500
   reject_limit: 99999
   concurrent: 3

synapse/handlers/message.py

@@ -1078,6 +1078,7 @@ class EventCreationHandler:
         else:
             prev_event_ids = await self.store.get_prev_events_for_room(builder.room_id)
 
+        logger.info("allow_no_prev_events=%s", allow_no_prev_events)
         # Do a quick sanity check here, rather than waiting until we've created the
         # event and then try to auth it (which fails with a somewhat confusing "No
         # create event in auth events")

synapse/storage/databases/main/cache.py

@@ -54,6 +54,7 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
         db_conn: LoggingDatabaseConnection,
         hs: "HomeServer",
     ):
+        logger.info("CacheInvalidationWorkerStore constructor")
         super().__init__(database, db_conn, hs)
 
         self._instance_name = hs.get_instance_name()
@@ -222,6 +223,7 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
         # This invalidates any local in-memory cached event objects, the original
         # process triggering the invalidation is responsible for clearing any external
         # cached objects.
+        logger.info("_invalidate_caches_for_event event_id=%s", event_id)
         self._invalidate_local_get_event_cache(event_id)
         self.have_seen_event.invalidate((room_id, event_id))
 

synapse/util/ratelimitutils.py

@@ -216,6 +216,9 @@ class _PerHostRatelimiter:
         self.reject_limit = config.reject_limit
         self.concurrent_requests = config.concurrent
 
+        logger.info("self.sleep_limit=%s", self.sleep_limit)
+        logger.info("self.reject_limit=%s", self.reject_limit)
+
         # request_id objects for requests which have been slept
         self.sleeping_requests: Set[object] = set()
 

tests/storage/databases/main/test_events_worker.py

@@ -20,6 +20,9 @@ from twisted.enterprise.adbapi import ConnectionPool
 from twisted.internet.defer import CancelledError, Deferred, ensureDeferred
 from twisted.test.proto_helpers import MemoryReactor
 
+import synapse.rest.admin
+import synapse.rest.client.login
+import synapse.rest.client.room
 from synapse.api.room_versions import EventFormatVersions, RoomVersions
 from synapse.events import make_event_from_dict
 from synapse.logging.context import LoggingContext
@@ -33,12 +36,20 @@ from synapse.storage.databases.main.events_worker import (
 from synapse.storage.types import Connection
 from synapse.util import Clock
 from synapse.util.async_helpers import yieldable_gather_results
+from tests.test_utils.event_injection import create_event
 
 from tests import unittest
 
 
 class HaveSeenEventsTestCase(unittest.HomeserverTestCase):
+    servlets = [
+        synapse.rest.admin.register_servlets,
+        synapse.rest.client.login.register_servlets,
+        synapse.rest.client.room.register_servlets,
+    ]
+
     def prepare(self, reactor, clock, hs):
+        self.hs = hs
         self.store: EventsWorkerStore = hs.get_datastores().main
 
         # insert some test data
@@ -121,6 +132,42 @@ class HaveSeenEventsTestCase(unittest.HomeserverTestCase):
             self.assertEqual(res, {self.event_ids[0]})
             self.assertEqual(ctx.get_resource_usage().db_txn_count, 0)
 
+    def test_persisting_event_invalidates_cache(self):
+        with LoggingContext(name="test") as ctx:
+            alice = self.register_user("alice", "pass")
+            alice_token = self.login("alice", "pass")
+            room_id = self.helper.create_room_as(alice, tok=alice_token)
+
+            event, event_context = self.get_success(
+                create_event(
+                    self.hs,
+                    room_id=room_id,
+                    room_version="6",
+                    sender=alice,
+                    type="test_event_type",
+                    content={"body": "foobarbaz"},
+                )
+            )
+
+            # Check first `have_seen_events` for an event we have not seen yet
+            # to prime the cache with a `false`.
+            res = self.get_success(
+                self.store.have_seen_events(event.room_id, [event.event_id])
+            )
+            self.assertEqual(res, set())
+
+            # that should result in a single db query to lookup if we have the
+            # event that we have not persisted yet.
+            self.assertEqual(ctx.get_resource_usage().db_txn_count, 1)
+
+            persistence = self.hs.get_storage_controllers().persistence
+            self.get_success(
+                persistence.persist_event(
+                    event,
+                    event_context,
+                )
+            )
+
 
 class EventCacheTestCase(unittest.HomeserverTestCase):
     """Test that the various layers of event cache works."""

tests/test_utils/event_injection.py

@@ -93,7 +93,8 @@ async def create_event(
         KNOWN_ROOM_VERSIONS[room_version], kwargs
     )
     event, context = await hs.get_event_creation_handler().create_new_client_event(
-        builder, prev_event_ids=prev_event_ids
+        builder,
+        prev_event_ids=prev_event_ids,
     )
 
     return event, context